Pattern for casting



2 Sheetsw-Sheet 2.

(No Model.)

F. M. STEVENS.

PATTERN FOR GASTING.

Patented Apr. 10, 1888.

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Unrrnn STATES ATnNr FREDERICK M. STEVENS, OF BROQKLYN, NEW YORK.

PATTERN FOR CASTING.

SPECIFICATION forming part of Letters Patent No. 380,827, dated April 10, 1888.

Application filed July 25, 1887. Serial No. 245,238. (No model.)

To all whom it may concern:

Beitknown that LFREDERIOK M. STEVENS, of Brooklyn, New York, have invented certain new and useful Improvements in Patterns for Castings; and I'do hereby declare the following to be a full, clear, and exact'descrip tion of my invention,which will enable others skilled in the art to which it appertaius to make and use the same.

My invention relates to a new and improved means of casting metal about tapped nuts, whereby the nut may be automatically located in the mold and accurately held in position there during the operation of casting without the use of supplementary holding devices.

The object of my invention is to produce in manufacttires of cast metal, without the labor or expense of drilling and tapping and without the use of supplementary holding devices, screw-holes which shall be uniform in size and have such absolute accuracy of position and place as to be exactly in line with the hole drilled or cast in any one of a number of duplicate corresponding parts of the manufacture.

In the case of many manufactures made wholly or partly of cast metal the pieces are held together by screws passing through one piece and screwed into a hole drilled and tapped in the other piece after casting. A familiar example is the case of hot-air and ventilating registers, where the perforated face is usually fastened to the frame in this manner. The frame is cast with lugs at the corners or elsewhere,and these'lugs are drilled and tapped to correspond with holes cast in the face of the register. Three distinct operations are thus made necessary in the lugs-the casting, the drilling, and the tapping. \rVhere this method of producing the screw-holes is employed it is practically difficult to locate the screwhole so as to be in line with the hole drilled or castin the corresponding part of the register or other manufacture,and a slight deviation in the position of the screw-hole in the lug will make it impossible to screw the parts together. An additional disadvantage is that iron is liable to come out so hard in casting that the lug cannot be drilled or tapped and the casting is useless. Attempts have been heretofore made to obviate these difficulties by introducing a nut into the mold and securing it by casting other parts around it; but in all these attempts either the nut has been introduced into the mold after the pattern is drawn, in which case it is impossible to locate the hole accurately, or else some supplementary device--such as a mandrel or stud-has been employed to hold the nut in place in the pattern or the mold.

I am also aware that attempts have heretofore been made to introduce previously-prepared parts of a metallic structure into a mold by inserting the parts in the pattern; but in these attempts,also,a hood or some other sup plementary device for holding the previouslyprepared part has been employed. This sup plementary device has to be removed after the casting is made, and the operation is thus rendered both more complicated and more expensive.

My invention does away with any supple mentary holding device, the nut being supported in the mold solely by the sand. At the same time the screw-hole is located accurately and automatically.

In order to explain myinvention I make the following detailed descriptiomreference being had to the accompanying drawings, which are hereby made a part of this specification.

In the figures similar letters refer to similar parts.

Figure 1 is a front elevation of so much of the face and frame of a hot-air register as will show the application of my invention. Fig. 2 is a cross-section of Fig. 1 through 2 2. Fig. 3 is a view of the pattern P,with nuts E E in place in the lugs D D,prior to molding. Fig. 4. is a vertical section of the flasl;,showing the pattern in the sand and the nuts in the pattern. Fig. 5 is a vertical section of the flask and mold after the pattern is drawn, the nuts remaining in the sand. Fig. 6 is a cross-section of Fig. 4 through line 6 6.

A is the side of the register.

B is the end piece.

D is the lug.

The inclosed nut appears at E E.

To carry out my invention in its preferred form I take a tappet-nut, E, of iron or other metal and of any desired size. On the pattern P, from which the mold is to be made, which pattern may be of any suitable material, I construct a forked lug, D, having branches at d, and groove the inner face of each branch to fit the nut at c c, the branches being of such ICO size as when grooved to allow metal enough to give the required strength about the nut. The branches d cl are at such a distance apart and of such a size as loosely to receive and hold the nut E, which just slides into and out of the grooves c c easily, and at the same time to leave the hole G and a part of each side of the nut E at K K exposed. The nuts being placed in position in the pattern,when the operation of molding is gone through witlnthe sand will be packed on each side of the nut E at K K and through the hole G. When the pattern is drawn,the nut E will be left in its correct position in the mold, and will be held accurately in place until the casting is complete merely by frictional contact with the sand without any supplementary holding device. The sand will prevent the hot metal from entering the screw-hole G, while at the same time the nut E will become securely integral with the finished casting. hen the casting is completed, the hole G will be exactly in position to receive the screw F. All necessity for a hood or other supplementary holding device is thus done away with. The correct position in the 2 casting for the hole G being once determined, the position is fixed by constructing the forked lug on the pattern so as to hold the nut at just the proper point. Then the hole G will appearin its proper position in the casting with absolute and unvarying accuracy.

The mold-box is shown at X, the bottom board at X.

.I do not claim, broadly, securing a nut in a metallic structure by introducing the nut into a mold and casting other parts about the nut; but

What I do claim as new, and desire to secure by Letters Patent, is

The pattern 1?, having forked lug D pro- 0 jecting from its face,said lug having branches (1 d grooved internally at c c to fit a tappet-nut,

E, substantially as shown and described, and for the purposes set forth.

FREDERICK M. STEVENS.

Witnesses: I

FRANK L. CRAWFORD, JAMEs ONEIL. 

